Abstract

A multiplexed diode-laser sensor system has been developed to monitor multiple species and measure multiple flowfield parameters along a single path with optical fibers and scanned-laser absorption techniques. Two InGaAsP lasers were tuned over H2O transitions near 1347 and 1392 nm, and an AlGaAs laser was tuned over an O2 transition near 760.65 nm to record fully resolved absorption concurrently at a repetition rate of 2 kHz. The system was applied to measure H2O, O2, and temperature simultaneously in a heated static cell and in room air. Wavelength modulation with second-harmonic detection, applied simultaneously in the O2 measurements, yielded a minimum detectable absorbance of 1.6 × 10−6/Hz1/2 and an O2 detectivity of 6.3 parts in 106 in a 1-m path length.

© 1994 Optical Society of America

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References

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1994

1993

1991

1989

1988

A. C. Stanton, J. A. Silver, Appl. Opt. 24, 5009 (1988).
[CrossRef]

1987

K. J. Ritter, T. D. Wilkerson, J. Mol. Spectrosc. 121, 1 (1987).
[CrossRef]

1983

1981

J. Reid, D. Labrie, Appl. Phys. B 26, 203 (1981).
[CrossRef]

Arroyo, M. P.

Baer, D. S.

M. P. Arroyo, T. P. Birbeck, D. S. Baer, R. K. Hanson, Opt. Lett. 19, 1091 (1994).
[CrossRef] [PubMed]

D. S. Baer, H. A. Chang, R. K. Hanson, J. Quant. Spectrosc. Radiat. Transfer 50, 621 (1993).
[CrossRef]

Birbeck, T. P.

Chang, H. A.

D. S. Baer, H. A. Chang, R. K. Hanson, J. Quant. Spectrosc. Radiat. Transfer 50, 621 (1993).
[CrossRef]

Gallagher, T. F.

Hanson, R. K.

Labrie, D.

J. Reid, D. Labrie, Appl. Phys. B 26, 203 (1981).
[CrossRef]

Lenth, W.

Philippe, L. C.

Reid, J.

J. Reid, D. Labrie, Appl. Phys. B 26, 203 (1981).
[CrossRef]

Riris, H.

Ritter, K. J.

K. J. Ritter, T. D. Wilkerson, J. Mol. Spectrosc. 121, 1 (1987).
[CrossRef]

Silver, J. A.

A. C. Stanton, J. A. Silver, Appl. Opt. 24, 5009 (1988).
[CrossRef]

Stanton, A. C.

A. C. Stanton, J. A. Silver, Appl. Opt. 24, 5009 (1988).
[CrossRef]

Tate, D. A.

Toth, R. A.

Wang, L.

Wilkerson, T. D.

K. J. Ritter, T. D. Wilkerson, J. Mol. Spectrosc. 121, 1 (1987).
[CrossRef]

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Figures (5)

Fig. 1
Fig. 1

Experimental schematic.

Fig. 2
Fig. 2

Raw data transmission signals.

Fig. 3
Fig. 3

Temperatures measured in the static cell.

Fig. 4
Fig. 4

H2O pressures measured in the static cell.

Fig. 5
Fig. 5

Reduced O2 absorption and second-harmonic absorption line shapes.

Tables (2)

Tables Icon

Table 1 Operating Conditions for the Lasers

Tables Icon

Table 2 H2Q Spectroscopic Parameters (T = 296 K)a

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